The study reported on in this memorandum was directed at determining how performance and resource consumption change as the M151 1/4-ton truck ages. On the basis of this analysis an optimum age for replacement is recommended. The data base of the study was the operational and maintenance history of 772 M151's observed in Europe from their times of issue as new vehicles to an average accumulation of 13,600 miles over an average period of 18 months. A few vehicles were seen at ages beyond 25,000 miles and 24 months. Maintenance histories for each vehicle were compiled from Army maintenance records. These histories identified maintenance actions by date and vehicle mileage and also showed the nature of the maintenance action, man-hour consumption, parts and components involved, and echelon at which the maintenance was performed.

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